Effect of white light on cell expansion and lipid netabolism in sunflower cotyledons (original) (raw)
1997, Journal of Plant Physiology
The growth of the cotyledons of etiolated sunflower seedlings (Helianthus annuus L.) is promoted by white light (WL). This process is due to an enhancement in the rate of cell expansion. The degradation of lipid reserves is stimulated by WL. An analysis of different fractions of homogenized cotyledons revealed rhat rhe enzyme lipase is exclusively localized in the oil bodies (oleosomes) of rhe cells. In WL-treated seedlings, lipolytic activity was higher rhan in dark-grown controls. In contrast, the specific activity of isocitrate lyase, a key enzyme of the glyoxylate cycle, was reduced upon exposure to WL. The results are discussed with respect to rhe relationship between sugar accumulation and cell expansion in the cotyledons and rhe hypocotyl of the developing sunflower seedling.
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